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#!/bin/bash
#
#   pacscripts : tries to print out the {pre,post}_{install,remove,upgrade}
#   scripts of a given package
#
#   Copyright (c) 2009 Giulio "giulivo" Fidente <giulivo.navigante@gmail.com>
#   Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
#   Copyright (c) 2009-2015 Pacman Development Team <pacman-dev@archlinux.org>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# bash options
set -o nounset
set -o errexit

declare -r myname='pacscripts'
declare -r myver='@PACKAGE_VERSION@'

conf="@sysconfdir@/pacman.conf"

if [ ! -r "$conf" ]; then
        echo "ERROR: unable to read $conf"
        exit 1
fi

eval $(awk '/DBPath/ {print $1$2$3}' "$conf")
eval $(awk '/CacheDir/ {print $1$2$3}' "$conf")
pac_db="${DBPath:-@localstatedir@/lib/pacman}/local"
pac_cache="${CacheDir:-@localstatedir@/cache/pacman/pkg}"

error() {
        local mesg=$1; shift
        printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
}

usage() {
        echo "${myname} (pacman) v${myver}"
        echo
        echo "Prints the {pre,post}_{install,remove,upgrade} scripts of a given package."
        echo
        echo "Usage: ${myname} <pkgname|pkgfile>"
        echo
        echo " Options:"
        echo "  -h, --help                 Print this help message"
        echo "  -v, --version              Print program name and version"
        echo
        echo "Example: ${myname} gconf-editor"
        echo "Example: ${myname} gconf-editor-3.0.1-3-x86_64.pkg.tar.xz"
}

version() {
        printf "%s %s\n" "$myname" "$myver"
        echo 'Copyright (c) 2009 Giulio "giulivo" Fidente <giulivo.navigante@gmail.com>'
        echo 'Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>'
}

spacman() {
        if [ $EUID -eq 0 ]; then
                pacman "$@"
        else
                if ! type -p sudo; then
                        error "Cannot find the sudo binary!"
                        error "${myname} requires root privileges. Either install \"sudo\" or run as root."
                        exit 1
                else
                        sudo pacman "$@"
                fi
        fi
}

print_db() {
        pkg=$(pacman -Q "$1")
        pkg=${pkg/ /-}
        if [ -f $pac_db/$pkg*/install ]; then
                cat $pac_db/$pkg*/install
                echo
                return 0
        else
                error "Package $1 does not include any .INSTALL script"
                return 1
        fi
}

print_pkg() {
        if ! bsdtar -xqOf "$1" .INSTALL 2>/dev/null; then
                error "Package $1 does not include any .INSTALL script"
                return 1
        fi
        echo
}

print_scriptlet() {
        if [ -f "$1" ]; then
                if bsdtar tf "$1" .PKGINFO &>/dev/null; then
                        print_pkg "$1"
                        return
                fi
        fi
        if pacman -Q "$1" &>/dev/null; then
                print_db "$1"
                return
        fi
        if ! pacman -Si $1 &>/dev/null; then
                error "Package $1 not found"
                return 1
        fi
        url=$(pacman -Sddp $1)
        filename=$(basename $url)
        if [ ! -f "$pac_cache/$filename" ]; then
                if ! spacman -Sddw --noconfirm $1 >&2; then
                        error "Failed to download $1"
                        return 1
                fi
                echo >&2
        fi
        print_pkg "$pac_cache/$filename"
        return
}

if [ $# -ne 1 ] ; then
        usage
        exit 1
fi

case "$1" in
        --help|-h) usage; exit 0 ;;
        --version|-V) version; exit 0 ;;
        *) print_scriptlet $1 ;;
esac